Q：What is the hardness of Q355 plate?
A：The Brinell hardness (HB) is generally between 130-180, which is a medium hardness and easy for cutting and welding.
Q：Does Q355 plate have good weldability?
A：Yes, Q355 has excellent weldability. It can be welded by common methods such as arc welding, gas welding, and resistance welding without preheating (for plates with thickness ≤ 20mm). Preheating is recommended for thicker plates to prevent cold cracks.
Q：What is the impact energy requirement of Q355D plate?
A：Q355D plate requires a minimum impact energy of 34 J at -20℃, which ensures good toughness in cold environments.
Q：Can Q355 plate be heat treated to improve performance?
A：Q355 is usually used in the as-rolled state. It can be normalized or tempered to improve uniformity, but quenching and tempering are not recommended, as it will not significantly improve strength and may reduce weldability.
Q：What is the density of Q355 plate?
A：The density is 7.85 g/cm³, the same as ordinary carbon steel, which is convenient for weight calculation in engineering design.